How can you use the graphic design created by StrangeBanana for your own website?

You need to know some HTML and CSS (Cascading Style Sheets) to implement on your own website the graphic design created by StrangeBanana.
If you've worked with HTML and CSS you will probably be able to
figure out what to do just by looking at the sourcecode (both HTML and CSS) on the generator page.
Basically, you have to do two things:

Copy the internal stylesheet from the StrangeBanana page into your own stylesheet